A pipe can If a pipe can fill a cistern in 3 hours and another can fill the same cistern in 4 hours,
but a third one can empty the full tank in 2 hours, and all of them are
opened together.how much time taken fill the cistern?
a. 15 hrs
b. 12 hrs
c. 24 hrs
d. 9 hrs
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Answer will be 24 hours
Answered by
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THE ANSWER IS 12 hrs
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